In Bio War II you will have a nice secretary whose name is Lily. At first she will teach you how to play the game. You can send her Roses, Chocolate, Pawpaw Milk to increase your intimacy. Each day you have 10 attempts. With a higher intimacy, you will enjoy some benefits, like having a shorter time for AFK, increasing Zippo HP. While for Pawpaw Milk, you can even get Assassination Task from Lily, which will gain you lots of EXP.